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k in (-oo:+oo)
33 = k+4*k+8 // - k+4*k+8
33-k-(4*k)-8 = 0
33-k-4*k-8 = 0
25-5*k = 0 // - 25
-5*k = -25 // : -5
k = -25/(-5)
k = 5
k = 5
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